Ritter, R., Wilhelm, R. A., Ginzel, R., Kowarik, G., Heller, R., El-Said, A. S., Papaléo, R. M., Rupp, W., Crespo López-Urrutia,
J. R., Ullrich, J., Facsko, S., & Aumayr, F. (2012). Pit formation on poly(methyl
methacrylate) due to ablation induced by individual slow highly charged ion impact. Europhysics letters,
97(1):, pp. 1-5. doi:10.1209/0295-5075/97/13001.